tests/test-inotify-issue1556

patch: support diff data loss detection and upgrade

In worst case, generating diff in upgrade mode can be two times more expensive
than generating it in git mode directly: we may have to regenerate the whole
diff again whenever a git feature is detected. Also, the first diff attempt is
completely buffered instead of being streamed. That said, even without having
profiled it yet, I am convinced we can fast-path the upgrade mode if necessary
were it to be used in regular diff commands, and not only in mq where avoiding
data loss is worth the price.

#!/bin/sh

"$TESTDIR/hghave" inotify || exit 80

hg init

touch a b
hg add a b
rm b

echo % status without inotify
hg st

echo "[extensions]" >> $HGRCPATH
echo "inotify=" >> $HGRCPATH

echo % inserve
hg inserve -d --pid-file=hg.pid 2>&1
cat hg.pid >> "$DAEMON_PIDS"

echo % status
hg st

sleep 1
echo "Are we able to kill the service? if not, the service died on some error"
kill `cat hg.pid`